How to drag certain image in iOS?

Question

Wanted to know how I can drag a image across screen and what code would be used. Tried looking up but only older versions of Swift have answer and no longer work. I want to

Answer 1

You need to subclass UIImageView and in the init you need to set userInteractionEnabled = true and then override this method override func touchesMoved(touches: Set, withEvent event: UIEvent?) well, my code is this:

    class DraggableImage: UIImageView {

    var localTouchPosition : CGPoint?

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.layer.borderWidth = 1
        self.layer.borderColor = UIColor.red.cgColor
        self.isUserInteractionEnabled = true
    }

    override func touchesBegan(_ touches: Set, with event: UIEvent?) {
        let touch = touches.first
        self.localTouchPosition = touch?.preciseLocation(in: self)
    }

    override func touchesMoved(_ touches: Set, with event: UIEvent?) {
        super.touchesMoved(touches, with: event)
        let touch = touches.first
        guard let location = touch?.location(in: self.superview), let localTouchPosition = self.localTouchPosition else{
            return
        }
        self.frame.origin = CGPoint(x: location.x - localTouchPosition.x, y: location.y - localTouchPosition.y)
    }

    override func touchesEnded(_ touches: Set, with event: UIEvent?) {
        self.localTouchPosition = nil
    }
    /*
     // Only override drawRect: if you perform custom drawing.
     // An empty implementation adversely affects performance during animation.
     override func drawRect(rect: CGRect) {
     // Drawing code
     }
     */

}

This is how it looks

Hope this helps